How to Bleed & Replace Brake Fluid on a 2014 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6)

Shop parts for a 2014 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.

This MotoSport-exclusive step-by-step guide shows how to replace the brake fluid and properly bleed the hydraulic brakes on a 2014 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6). Use this procedure to restore firm lever and pedal feel, remove air, and keep the system contaminant-free. Follow safety precautions and manufacturer recommendations for fluid type.

Safety & prep

  • Work on a level surface with the engine off, key removed, and parking brake applied.
  • Wear eye protection, gloves, and keep rags handy. Brake fluid damages paint & plastics; protect painted surfaces.
  • Use the manufacturer-recommended DOT brake fluid (check your owner's manual for DOT rating). Never mix brake fluid types unless the manual permits it.
  • Have fresh brake fluid, a clear bleed tube, a catch bottle, a wrench for the bleeder nipples, funnel, turkey baster or fluid syringe, and optionally a vacuum or pressure bleeder.
  • Keep the reservoir cap closed until ready and always top with fresh fluid during the procedure to avoid introducing air.

Notes specific to the 2014 TRX500 Rubicon 4X4 POWER STEERING (FM6)

  • The Rubicon uses hydraulic brakes and a separate hydraulic power steering system. Power steering fluid is NOT the same as brake fluid – do not cross-contaminate reservoirs or lines.
  • There are two brake circuits that may be driven by a combined master cylinder assembly. Bleed each circuit according to the sequence recommended for the TRX500: generally start with the caliper or wheel farthest from the master cylinder and proceed to the closest. If unsure, follow the order: rear right, rear left, front right, front left.
  • Inspect brake lines, hoses, calipers, pads, and rotors for wear or damage while working. Replace any suspect components before completing bleeding.
  • Keep the brake fluid reservoir cap vent clean and the diaphragm in place. Replace the reservoir cap seal if cracked or deteriorated.

Step A – Remove old fluid from reservoir

  1. Locate the brake fluid reservoir on the handlebar/master cylinder (and any secondary reservoirs). Clean the area around the cap to prevent contamination.
  2. Use a syringe or turkey baster to remove as much old fluid as possible from the reservoir(s).
  3. Refill with fresh brake fluid to the specified level mark. Do not overfill.

Step B – Bleed sequence overview

Use one of these methods depending on your tools: two-person pump-and-hold bleed, one-person squeeze-and-open, vacuum bleeder, or pressure bleeder. A pressure or vacuum bleeder is faster and cleaner; two-person method is common and reliable.

Step C – Two-person pump-and-hold method

  1. Mount clear tubing onto the bleeder nipple at the farthest caliper. Put the other end in a catch bottle partially filled with old fluid to prevent air re-entry.
  2. Have your helper slowly pump the brake lever/pedal several times and hold it fully applied.
  3. Open the bleeder nipple 1/4 to 1/2 turn to allow fluid and air to escape until flow slows; then close the nipple. Instruct helper to release the lever/pedal only after the nipple is closed.
  4. Repeat pump, hold, open, close cycles until no air bubbles appear in the clear tubing and the fluid runs clear.
  5. Top up the reservoir as needed during the process to prevent it from running dry and drawing air into the system.
  6. Proceed to the next wheel in the bleed order: rear right, rear left, front right, front left.

Step D – One-person squeeze method (if no helper)

  1. Use a brake lever or pedal clamp tool or a one-way bleed kit. Pump the lever/pedal several times and hold it. Use the clamp to hold it in position or use a one-way adapter that keeps fluid from returning.
  2. Open bleeder nipple, allow fluid to escape, then close nipple, and release clamp or lever. Repeat until fluid is free of bubbles.
  3. Top off reservoir frequently to avoid drawing air.

Step E – Using a vacuum or pressure bleeder

  • Attach the vacuum hose to the bleeder nipple and draw fluid until clear. Move through bleed order from farthest to nearest wheel.
  • With a pressure bleeder, pressurize the reservoir according to the tool's instructions, then open each bleeder to purge air. Monitor reservoir level and fluid clarity.

Step F – Replacing all fluid (full flush)

  1. If doing a complete fluid change, remove and refill the reservoir several times while bleeding to dilute and remove old fluid until the expelled fluid matches the new fluid color.
  2. Ensure every line and caliper has been cycled so contaminated fluid is flushed out.

Finishing steps & checks

  • Confirm bleeder nipples are snug — torque to manufacturer spec if known, or snug plus a small additional turn. Avoid over-torquing.
  • Ensure reservoir level is at the correct mark, reinstall cap and diaphragm, and clean any spilled fluid from painted surfaces immediately.
  • Test lever/pedal firmness with engine off first. Then start engine and test again (if brake system uses vacuum assist or similar). There should be a firm, consistent feel — soft or spongy feel indicates more air remains.
  • Do a low-speed safety test ride in a safe area to confirm braking performance before normal use.
  • Dispose of old brake fluid responsibly at a hazardous-waste or recycling facility.

Troubleshooting

  • Persistent spongy pedal: repeat bleeding sequence, verify reservoir never ran dry, inspect for leaks.
  • Leaky bleeder nipple or damaged hose: replace hardware and re-bleed.
  • Contaminated or dark fluid after multiple flushes: inspect calipers, lines, and master cylinder for internal contamination; consider component replacement.

Maintenance tips specific to this TRX500 model

  • Check brake pads and rotor condition whenever you change fluid. Replace pads before excessive wear reaches caliper pistons.
  • Because this model has power steering, visually inspect PS lines & reservoir for leaks when servicing brakes. Keep PS fluid separated and topped to its spec; do not confuse reservoirs.
  • Use OEM-quality replacement parts for bleeder valves, reservoir caps, and seals to ensure proper fit and corrosion resistance in off-road conditions.
  • Record the service date and brake fluid type used. Brake fluid absorbs moisture over time – plan to replace it per Honda intervals or every 1-2 years for severe/ wet-use conditions.

Following this MotoSport procedure will restore braking performance and reduce the risk of air-related failures. If you encounter internal master cylinder issues or ongoing leaks, have the system inspected by a qualified technician.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.